Adobe Photoshop CC 2014 v.14.xx - Manual (Page 270)

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Note:
Note:
Note:
You cannot use an adjustment or fill layer as the target layer for a merge.
In addition to merging layers, you can stamp them. Stamping allows you to merge the contents of more than one layer into a target layer while
leaving the other layers intact.
When you save a merged document, you cannot revert back to the unmerged state; the layers are permanently merged.
Merge two layers or groups
1. Make sure that the layers and groups you want to merge are visible.
2. Select the layers and groups you want to merge.
3. Choose Layer > Merge Layers.
You can merge two adjacent layers or groups by selecting the top item and then choosing Layer > Merge Layers. You can merge linked
layers by choosing Layer > Select Linked Layers, and then merging the selected layers. You can merge two 3D layers by choosing Layer > Merge
Layers; they will share the same scene and the top layer will inherit the bottom layer 3D properties (the camera views must be the same for this to
be enabled).
Merge layers in a clipping mask
1. Hide any layers that you do not want to merge.
2. Select the base layer in the clipping mask. The base layer must be a raster layer.
3. Choose Merge Clipping Mask from the Layers menu or the Layers panel menu.
For more information on clipping masks, see Mask layers with clipping masks.
Merge all visible layers and groups in an image
Choose Merge Visible from the Layers panel or the Layers panel menu. All layers showing an eye icon are merged.
A visible layer must be selected to enable the Merge Visible command.
Stamp multiple layers or linked layers
When you stamp multiple selected layers or linked layers, Photoshop creates a new layer containing the merged content.
1. Select multiple layers.
2. Press Ctrl+Alt+E (Windows) or Command+Option+E (Mac OS).
Stamp all visible layers
1. Turn visibility on for the layers you want to merge.
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